<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card class="box-card">
      <el-alert title="添加商品信息" type="info" show-icon center :closable="false"></el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!--  -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px"
      label-position="top">
        <el-tabs :tab-position="'left'" stretch v-model="activeIndex"
        :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price" disabled>
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                :options="catelist"
                :props="cateProps"
                v-model="addForm.goods_cat"
                @change="handleChange"
                clearable>
                </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item v-for="item in manyTableData" :key="item.attr_id" :label="item.attr_name">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" style="margin:8px"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示文件上传的后台接口地址 -->
            <el-upload
              :action="upLoadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :multiple="true"
              :headers="headerObj"
              :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce">
            </quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" style="margin-top:15px" @click="addGoods">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <el-dialog
      title="图片预览"
      :visible.sync="previewDialogVisiable"
      width="50%"
      >
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  computed: {
    // 计算当前选中的三级属性id
    thirdCateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  },
  data() {
    return {
      // 上传图片的URL地址
      upLoadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 预览图片的绝对路径
      previewPath: '',
      // 控制预览图片对话框的显示与隐藏
      previewDialogVisiable: false,
      // 默认激活第一步
      activeIndex: 0,
      // 添加商品的表单对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        pics: [],
        // 商品详情描述
        goods_introduce: '',
        attrs: []
      },
      // 商品分类数据
      catelist: [],
      // 动态参数列表数组
      manyTableData: [],
      // 静态属性列表数组
      onlyTableData: [],
      // 添加商品的表单验证对象
      addFormRules: {
        goods_name: [{
          required: true,
          message: '请输入商品名称',
          trigger: 'blur'
        }],
        goods_price: [{
          required: true,
          message: '请输入商品价格',
          trigger: 'blur'
        }],
        goods_weight: [{
          required: true,
          message: '请输入商品重量',
          trigger: 'blur'
        }],
        goods_number: [{
          required: true,
          message: '请输入商品数量',
          trigger: 'blur'
        }],
        goods_cat: [{
          required: true,
          message: '请选择商品分类',
          trigger: 'blur'
        }]
      },
      // 级联选择器的配置对象
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类信息失败')
      }
      this.catelist = res.data
      console.log(this.catelist)
    },
    // 级联选择器选中项发生变化 触发函数
    handleChange() {
      console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // tab切换时的函数 禁止标签切换
    beforeTabLeave(activeName, aldActiveName) {
      if (aldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类')
        return false
      }
    },
    // tab标签被选中时执行的函数
    async tabClicked() {
      // console.log(this.activeIndex)
      // 证明选中的是商品参数面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.thirdCateId}/attributes`
          , { params: { sel: 'many' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败')
        }
        this.$message.success('获取参数列表成功')
        // console.log(res.data)
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === '0' ? [] : item.attr_vals.split(',')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') { // 选中的是静态属性
        const { data: res } = await this.$http.get(`categories/${this.thirdCateId}/attributes`
          , { params: { sel: 'only' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败')
        }
        this.$message.success('获取参数列表成功')
        console.log(res.data)
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览事件
    handlePreview(previweFile) {
      this.previewPath = previweFile.response.data.url
      this.previewDialogVisiable = true
    },
    // 移除图片的事件
    handleRemove(removeFile) {
      // 1.获取将要删除的图片临时地址
      const tempFilePath = removeFile.response.data.tmp_path
      // 2.从pics数组中找到该图片对应的索引值
      const removeFileIndex = this.addForm.pics.findIndex(x => x.pic === tempFilePath)
      // 3.调用splice方法 将该图片信息对象 从pics数组中移除
      this.addForm.pics.splice(removeFileIndex, 1)
      console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      // console.log(response)
      // 拼接得到图片信息对象
      const picInfo = {
        pic: response.data.tmp_path
      }
      // 将文件信息对象push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm.pics)
    },
    // 添加商品
    addGoods() {
      // console.log(this.addForm)
      // 点击添加商品按钮的表单预验证
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        // 执行添加的业务逻辑
        const newaddFrom = _.cloneDeep(this.addForm)
        newaddFrom.goods_cat = newaddFrom.goods_cat.join(',')
        // console.log(newaddFrom.goods_cat)
        // 处理动态参数和静态属性
        this.manyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(',') }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        newaddFrom.attrs = this.addForm.attrs
        // console.log(newaddFrom)
        const { data: res } = await this.$http.post('goods', newaddFrom)
        console.log(res.meta.status)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.el-tabs{
  margin-top: 15px;
}
.previewImg{
  width: 100%;
}
</style>
